tileserver-gl/test/tiles_rendered.js

const testTile = function (prefix, z, x, y, format, status, scale, type) {
  if (scale) y += '@' + scale + 'x';
  const path = '/styles/' + prefix + '/' + z + '/' + x + '/' + y + '.' + format;
  it(path + ' returns ' + status, function (done) {
    const test = supertest(app).get(path);
    test.expect(status);
    if (type) test.expect('Content-Type', type);
    test.end(done);
  });
};

const prefix = 'test-style';

describe('Raster tiles', function () {
  describe('valid requests', function () {
    describe('various formats', function () {
      testTile(prefix, 0, 0, 0, 'png', 200, undefined, /image\/png/);
      testTile(prefix, 0, 0, 0, 'jpg', 200, undefined, /image\/jpeg/);
      testTile(prefix, 0, 0, 0, 'jpeg', 200, undefined, /image\/jpeg/);
      testTile(prefix, 0, 0, 0, 'webp', 200, undefined, /image\/webp/);
    });

    describe('different coordinates and scales', function () {
      testTile(prefix, 1, 1, 1, 'png', 200);

      testTile(prefix, 0, 0, 0, 'png', 200, 2);
      testTile(prefix, 0, 0, 0, 'png', 200, 3);
      testTile(prefix, 2, 1, 1, 'png', 200, 3);
    });
  });

  describe('invalid requests return 4xx', function () {
    testTile('non_existent', 0, 0, 0, 'png', 404);
    testTile(prefix, -1, 0, 0, 'png', 404);
    testTile(prefix, 25, 0, 0, 'png', 404);
    testTile(prefix, 0, 1, 0, 'png', 404);
    testTile(prefix, 0, 0, 1, 'png', 404);
    testTile(prefix, 0, 0, 0, 'gif', 400);
    testTile(prefix, 0, 0, 0, 'pbf', 400);

    testTile(prefix, 0, 0, 0, 'png', 404, 1);
    testTile(prefix, 0, 0, 0, 'png', 404, 5);

    // testTile('hybrid', 0, 0, 0, 'png', 404); //TODO: test this
  });
});